|
*Performance chip & add on disclaimer
Tampering with the pump's wires can cause premature pump failure.
If the wires are cut the pump is no longer warrantable, and any repairs
that need to be made to the injection pump will be the buyer's
responsibility. In the VP44 pump the fuel is used to cool and
lubricate the pump, and the tolerances between the head and the
rotor is very fine. Performance chip add-ons affect the
cooling rate of the pump. The pump will become hotter due to excessive
RPMs from the chips programming. When the throttle is backed off
the fuel to the pump is reduced, and the pump's cooling capabilities are
greatly reduced. Since the pump is hotter from the increased RPMs
the rotor siezes in the head and the pump fails. An alternative to
cutting into the pump's wires is to use a chip that plugs directly into
the trucks ECM. This approach will allow for an increase in HP while not excessively
heating the fuel pump. A great example
of this is the DiabloSport Power Puck.
|
|
*Defective VP44 Engine Codes
The retrieval of codes does not constitute an engine diagnosis. However, there are
some codes that usually indicate a defective injection pump. A current P1688 always means
that the pump is bad, there is no further diagnosis required. Code P0216 is probably the
most common code for VP-44 Pumps. If transfer pump pressure has been checked and is O.K.,
the injection pump is defective. Other codes that are less common are P0180, P0181, P0215,
P0251, P0252, P0253, P0254, P0370, P1287, P1689 and P1690. These codes USUALLY, but not
always indicate a defective pump. There are wiring and power checks to be performed if
these codes are present. These codes relate to Dodge pickups only, and are not for any
other ISB application.
|
